intermediate representation HSV

[vg.git] / vg_imgui.h

diff --git a/vg_imgui.h b/vg_imgui.h
index 32fab4928b9266885ba860e2e4fe2d70bafe360a..5c957ed2ba1b053b3002e4e64299b8a7d8b7c2d4 100644 (file)
--- a/vg_imgui.h
+++ b/vg_imgui.h
@@ -1416,7 +1416,7 @@ static void ui_enum_post(void){
  * -----------------------------------------------------------------------------
  */
 
-static void _ui_slider( ui_rect box, 
+static enum ui_button_state _ui_slider( ui_rect box, 
                         f32 min, f32 max, f32 *value, const char *format ){
    f32 t;
 
@@ -1446,6 +1446,8 @@ static void _ui_slider( ui_rect box,
    char buf[32];
    snprintf( buf, sizeof(buf), format? format: "%.2f", *value );
    ui_text( box, buf, 1, k_ui_align_middle_center, 0 );
+
+   return state;
 }
 
 static void ui_slider( ui_rect inout_panel, const char *str_label, 
@@ -1472,8 +1474,13 @@ static void ui_colourpicker( ui_rect inout_panel, const char *str_label,
    ui_split_ratio( sliders[0], k_ui_axis_h, 0.5f, 2, sliders[0], sliders[1] );
    ui_split_ratio( sliders[2], k_ui_axis_h, 0.5f, 2, sliders[2], sliders[3] );
 
+   v4f hsv;
+   vg_rgb_hsv( value, hsv );
+
+   enum ui_button_state modified = 0x00;
+
    for( u32 i=0; i<4; i ++ ){
-      _ui_slider( sliders[i], 0.0f, 1.0f, value+i, 
+      modified |= _ui_slider( sliders[i], 0.0f, 1.0f, hsv+i, 
                      (const char *[]){ "hue %.2f",
                                        "sat %.2f",
                                        "lum %.2f",
@@ -1484,6 +1491,7 @@ static void ui_colourpicker( ui_rect inout_panel, const char *str_label,
    ui_split_ratio( left, k_ui_axis_v, 0.8f, 8, square, preview );
 
    u32 state = ui_colourbutton( square, 0, 0, 0, 0 );
+   modified |= state;
 
    enum ui_button_state 
       mask_using = 
@@ -1493,50 +1501,40 @@ static void ui_colourpicker( ui_rect inout_panel, const char *str_label,
    
    if( state & mask_using ){
       for( u32 i=0; i<2; i ++ ){
-         value[1+i] = vg_clampf( 
+         hsv[1+i] = vg_clampf( 
                         (f32)(vg_ui.mouse[i] - square[i]) / (f32)(square[2+i]),
                         0.0f, 1.0f );
       }
 
-      value[2] = 1.0f-value[2];
+      hsv[2] = 1.0f-hsv[2];
+   }
+
+   if( modified & (k_ui_button_click|k_ui_button_holding_inside|
+                   k_ui_button_holding_outside) ){
+      vg_hsv_rgb( hsv, value );
    }
 
    ui_outline( square, 1, ui_colour( state? k_ui_fg+3: k_ui_bg+3 ), 0 );
 
    /* preview colour */
-   i32 i = floorf( value[0]*6.0f );
-   f32 v = value[2],
-       f = value[0] * 6.0f - (f32)i,
-       p = v * (1.0f-value[1]),
-       q = v * (1.0f-f*value[1]),
-       t = v * (1.0f-(1.0f-f)*value[1]);
-
    v4f colour;
-
-   switch( i % 6 ){
-      case 0: colour[0] = v; colour[1] = t; colour[2] = p; break;
-      case 1: colour[0] = q; colour[1] = v; colour[2] = p; break;
-      case 2: colour[0] = p; colour[1] = v; colour[2] = t; break;
-      case 3: colour[0] = p; colour[1] = q; colour[2] = v; break;
-      case 4: colour[0] = t; colour[1] = p; colour[2] = v; break;
-      case 5: colour[0] = v; colour[1] = p; colour[2] = q; break;
-   }
+   vg_hsv_rgb( hsv, colour );
    colour[3] = 1.0f;
    ui_fill( preview, v4f_u32_colour( colour ) );
 
    /* Draw hsv shader thingy */
    ui_flush( k_ui_shader_colour, vg.window_x, vg.window_y );
    ui_fill_rect( square, 0xffffffff, (ui_px[4]){ 0,256,256,0 } );
-   vg_ui.hue = value[0];
+   vg_ui.hue = hsv[0];
    ui_flush( k_ui_shader_hsv, vg.window_x, vg.window_y );
 
-   ui_rect marker = { square[0] + value[1] * (f32)square[2] - 4, 
-                      square[1] + (1.0f-value[2]) * (f32)square[3] - 4,
+   ui_rect marker = { square[0] + hsv[1] * (f32)square[2] - 4, 
+                      square[1] + (1.0f-hsv[2]) * (f32)square[3] - 4,
                       8, 8 },
            lx     = { square[0],
-                      square[1] + (1.0f-value[2]) * (f32)square[3],
+                      square[1] + (1.0f-hsv[2]) * (f32)square[3],
                       square[2], 1 },
-           ly     = { square[0] + value[1] * (f32)square[2],
+           ly     = { square[0] + hsv[1] * (f32)square[2],
                       square[1],
                       1, square[3] };